The last two releases (for Mac, at least on OSX 10.6.8), have broken where the menus for extensions appear -- they are now offset to the left, and for a window near the left edge of the screen, they can almost disappear off the left edge of the screen.

Stuck on Version 40.0.2202.3 dev (64-bit) on Mavericks. Even still, seems to be a bug there, dunno if fixed; Options dialogues open in new tab, not as per documentation (https://developer.chrome.com/extensions/optionsV2). Works fine in my Canary version when it was on V40.